Mat foundation

ABSTRACT

Mat foundation for use in construction work in a pit excavation in the ground, a foundation lattice framework is provided by juxtaposing concrete lattice frames on the bottom of the excavation. Foundation blocks are placed in alignment on the foundation lattice framework so as to be astride adjacent lattice frames, adjacent joints of the foundation blocks being so disposed as to be located over an open space of the foundation lattice framework. There, joints are connected and secured to each other by metal implements, a reinforcing bar being located on connecting metal implements. The lowermost ends of the reinforcing bar extends to the open space of the foundation lattice framework, which open space of the foundation blocks are filled with concrete.

Mori

[451 Nov. 19, 1974 MAT FOUNDATION Masahi Mori, No. 91 Aza-Matsuogawa,Zaohango, Yamagata-shi, Yamagata-ken, 1 Japan Filed: Apr. 18, 1973 Appl.No.: 352,177

Inventor:

Foreign Application Priority Data Sept. 2, 1973 Japan 48-16261 U.S. Cl52/169, 52/292, 52/295, I 52/432, 52/438, 52/583 Int. Cl E02d 27/00Field of Search 52/169, 292, 436, 438, 52/293, 294, 295, 742, 432, 583,274, 264, 606, 442, 586, 585, 584, 437, 259; 61/39 11/1954 Bridwell52/293 X Adams .1 52/586 FOREIGN PATENTS OR APPLICATIONS 759,688 5/1967Canada 52/274 Primary Examiner-Frank L. Abbott Assistant Examiner-CarlD. Friedman Attorney, Agent, or Firm-George B. Oujevolk [57] ABSTRACTMat foundation for use in construction work in a pit excavation in theground, a foundation lattice framework is provided by juxtaposingconcrete lattice frames on the bottom of the excavation. Foundationblocks are placed in alignment on the foundation lattice framework so asto be astride adjacent lattice frames, adjacent joints of the foundationblocks being so disposed as to be located over an open space of thefoundation lattice framework. There, joints are connected and secured toeach other by metal implements, a reinforcing bar being located onconnecting metal implements. The lowermost ends of the reinforcing barextends to the open space of the foundation lattice framework, whichopen space of the foundation blocks are filled with concrete.

2 Claims, 4 Drawing Figures I MAT FOUNDATION BACKGROUND OF THE INVENTIONBRIEF REVIEW OF THE PRIOR ART Heretofore, the mat foundation used inconstruction was installed as follows: The ground was excavated. Cobblestones were manually laid uniformly, grave] or the like being spreadthereon and consolidated by pounding. Concrete was then poured thereonand cured for a predetermined period of time. The surface was leveled byapplying mortar after hardening of the concrete. The mat foundation bodywas then installed after hardening of the mortar. Consequently, it wasnecessary to build frames after marking on the leveled mortar theposition of the breadth of the mat foundation body, concrete beingpoured and hardened in the frames, said frames being disassembled toobtain the required mat foundation body.

However, this method of installing a mat foundation body had a defect inthat it necessitated use of natural cobble stones which are now in shortsupply, and it comprised a large number of steps resulting in the lackof constructional precision. Moreover, the operation had to bediscontinued for a certain period of time until the concrete hardened,and a greatdeal of labor was necessary in building the frames for themat foundation body with the resultthat the operational efficiency andeconomy were greatly impaired.

The mat foundation according to the present invention makes it possibleto obviate the disadvantages involved in the aforementioned conventionalmat foundation installing method.

OBJECTS OF THE INVENTION Thus, it is an object of this invention toimprove the operational simplicity and the constructional precision byconstructing a mat foundation by means of combin- SUMMARY OF THEINVENTION Generally speaking, the present invention contemplates a matfoundation for use in construction .work in a pit excavation in theground, a foundation lattice framework is provided by juxtaposingconcrete lattice frames on the bottom of the excavation. Foundationblocks are placed in alignment on the foundation lattice framework so asto be astride adjacent lattice frames, adjacent joints of the foundationblocks being so disposed as to be located over an open space of thefoundation lattice framework. There, joints are connected and secured toeach other by metal implements, a reinforcing bar being located onconnecting metal implements. The lowermost ends of the reinforcing-barextends to the open space of the foundation lattice framework, whichopen space of the foundation blocks are filled with concrete.

' The preferred embodiments of this invention are de scribed in detailhereinunder with reference to the annexed drawings, of which:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of matfoundation according to this invention;

' FIG. 2 is a plan of said mat foundation contemplated herein;

FIG. 3 is a sectional view taken by the line Illlll in FIG. 2, showingthe state of installation on a pit excavation; and,

FIG. 4 is a sectional view showing another embodiment different fromthat of FIG. 3.

DETAILED DESCRIPTION Referring now to the drawings, the numeral 1denotes the ground, a pit excavation 2 being carried out in said ground,sand 3 being spread thereon uniformly, leakproof cloth 4 of vinyl or thelike being placed on said sand 3. As shown in FIG. 2, lattice frames 7,7' each consisting of concrete and comprising at least more than twolongitudinal bars 5, 5' and transve rse bars 6, 6' are juxtaposed and afoundation lattice framework 8 is thus constructed.

On the foundation lattice framework 8 are placed foundation blocks 9, 9in alignment and disposed rectangularly to longitudinal bars 5, 5 so asto be astride adjacent lattice frames 7, 7' and at least more than twolongitudinal bars 5, 5'

The adjacent joints 10 of the aligned foundation blocks 9, 9' areadapted to be located above an open space 11 of the foundation latticeframework 8. A pin 13 is inserted through metal implements 12, 12provided as jointing members on both ends of the foundation blocks 9, 9'thereby enabling to securely join the adjacent foundation blocks 9, 9'to each other.

The metal implements 12,12 are adapted to project from longitudinalconcave grooves 14 formed at both ends of the foundation blocks 9, 9.

On the adjoining sides of the foundation blocks 9-, 9' are knotches l5insertion of a pin 13 throughthe metal implements 12, 12.

The metal implements l2, 12 are provided at the upper and lower parts ofthe longitudinal concave grooves 14 of the foundation blocks 9, 9, oneof said metal implements 12 being in the shape of a flat plate, theother metal implement 12 being so formed as to have a concave part toreceive the flat metal implement 12 therebetween in a tongue in groovearrangement, the two metal implements l2, 12' being secured in place byinserting the pin 13 therethrough as shown in FIG. 2.

A reinforcing bar 16 having an inverted U-shaped section is fixed ontothe upper one of the jointing mem bers, the lowermost ends 17 of saidreinforcing bar 16 extending up to the open space 11 of the foundationlattice framework 8, thereafter the open space 11 and the joints 10 ofthe foundation blocks 9, 9' are filled with concrete 18 to obtain themat foundation.

In the embodiment shown in FIG. 4, the transverse bars 6, 6 of thelattice frame 7 are formed in the shape of an inverted trapezoid unlikethe case of the embodiment shown in FIG. 3. Therefore, the lattice framecan be leveled with ease by pounding the refilling earth 21 restored tothe apertures 20' between the side walls 19 of the pit excavation 2 andthe lattice frame 7 since the refilling earth 21 bites into the lowerend of lattice frame 7 as a result of the pounding.

In the embodiment shown in FIG. 3, the lowermost ends of the reinforcingbar 16 are outwardly bent respectively. However, as shown in FIG. 4,such outward bending is not always necessary.

Leakproof cloth 4 is spread on the sand 3 as shown in FIG. 3. However,such cloth 4 can also be omitted. Furthermore, as to the joints of theadjacent foundation blocks 9, 9' and the metal implements l2, 12' foruse in connecting said joints to each other as shown' in the drawings,it goes without saying that the construction of such joints and jointingmembers can be suitably modified.

Moreover, if the concrete 18 used is of the same quality as that of thelattice frame 7, the lattice frame 7 and the foundation block 9 can beintegrated.

As hereinbefore described, this invention relates to a mat foundationconstructed by the use of lattice frames and foundation blocks areproduced in the factory and assembled in the construction field with theresult that the constructional precision can be greatly increased.Moreover, since these lattice frames and foundation blocks are light andconvenient for transportation, the construction work is greatlyfacilitated.

As hereinbefore described, on a foundation lattice framework 8 made oflattice frames, foundation blocks 9, 9' are placed in alignment so as tobe astride adjacent lattice frames 7, 7'. The joints 10 of adjacentfoundation blocks 9, 9 are placed so as to be located above open space11 of the foundation lattice framework 8, the lowermost ends of areinforcing bar 16 is fixed onto the joints 10 and extends up to theopen space 1 1 of the foundation lattice framework 8, as a result ofwhich not only the foundation framework, but also the foundation blockscan be integrated and consolidated by filling the the constructionperiod can be greatly reduced since the assembling can be done withoutthe necessity of discontinuing work and waiting until the concretehardens.

I claim:

1.5 A mat foundation comprising in combination a foundation latticeframework of lattice frames juxtaposed on the bottom of a pitexcavation, said lattice frames having transverse bars formed in theshape of an inverted trapezoid; vertically elongated foundation blockshaving lateral joining sections aligned on the foundation latticeframework, each of said foundation blocks being so disposed as to beastride adjacent lattice frames; adjacent joining section of thefoundation blocks being so disposed as to be located above open spacesof the foundation lattice framework; notches on the joining sections tofacilitate the securing of the joining members; metal tongue, groove andpin joint members connecting said joining section to each other, saidtongue in one joining section entering the groove of another joiningsection to be held by said pin; a vertical reinforcing bar fixed to thejoining members, the lowermost ends of the reinforcing bar beinginwardly bent and extending into open space of the foundation latticeframework, the open space andthe joints being filled with concrete.

2. A mat foundation as defined in claim 1 wherein the concrete of thefoundation lattice framework is of the same quality as the concretepoured into the open space of said foundation lattice framework and thejoints of the foundation blocks.

1. A mat foundation comprising in combination a foundation latticeframework of lattice frames juxtaposed on the bottom of a pitexcavation, said lattice frames having transverse bars formed in theshape of an inverted trapezoid; vertically elongated foundation blockshaving lateral joining sections aligned on the foundation latticeframework, each of said foundation blocks being so disposed as to beastride adjacent lattice frames; adjacent joining section of thefoundation blocks being so disposed as to be located above open spacesof the foundation lattice framework; notches on the joining sections tofacilitate the securing of the joining members; metal tongue, groove andpin joint members connecting said joining section to each other, saidtongue in one joining section entering the groove of another joiningsection to be held by said pin; a vertical reinforcing bar fixed to thejoining members, the lowermost ends of the reinforcing bar beinginwardly bent and extending into open space of the foundation latticeframework, the open space and the joints being filled with concrete. 2.A mat foundation as defined in claim 1 wherein the concrete of thefoundation lattice framework is of the same quality as the concretepoured into the open space of said foundation lattice framework and thejoints of the foundation blocks.